During a recent study of factors influencing the riding quality of rigid pavement, compliance with the existing roughess specification was found not to ensure a smooth pavement. Because the 10-ft (3.05-m) strainghtedge used to check the surface can detect only large bumps, the remaining undetected roughness may result in unsatisfactory riding quality. This paper describes the development of a specification to ensure good riding quality in new pavements. The California profilograph was selected as the measurement device because it provides detailed information. Based on results of a subjective panel rating of pavement riding quality in New York State a project average profile index of 12 in./mile (190 mm/km) and a daily average of 15 in./mile (237 mm/km) are allowed. A limit is also placed on the size of individual bumps. These limits ensure user satisfaction but can be met by paving contractors using current procedures and equipment. Responsibility for controlling roughness during paving is left to the contractor, and the state measures the quality of the completed pavement. To ensure compliance with the specification, the payment received depends on the riding quality achieved. Development of the reduced payment schedule--based on the cost of overlaying the pavement before the end of its design life--is outlined. The years of service expected are related to the initial roughness by means of equations developed in the AASHO Road Test.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 1-13
  • Monograph Title: Concrete pavement construction and joints and loader-truck production studies
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00099906
  • Record Type: Publication
  • ISBN: 0309023866
  • Files: TRIS, TRB
  • Created Date: Nov 5 1975 12:00AM